docs: def render_scene(self):
  		"render scene one time"
  		self.init_gl() # should be a no-op after the first frame is rendered
  		SDL_GL_MakeCurrent ( self.window, self.context )
  		self.renderer.render_scene()
  		# Done rendering
  		# SDL_GL_SwapWindow(self.window)
  		glFlush()